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Globe reporter Campbell Clark has the answer:
There are two parties that favour proportional representation, and possibly a third, depending on how you count them. But there are some differences in the devilish details.
Both the Thomas Mulcair’s NDP and Elizabeth May’s Green Party say they will fight for proportional representation. Both say that if they won power, they’d change the voting system.
The Liberals also favour reform, but they are more vague on what kind. They promise to eliminate the current first-past-the-post voting system, but not necessarily to replace it with proportional representation. They’d have a parliamentary committee study it.
There are other differences between the parties on this issue. That’s partly because there are different kinds of reform, and different kind of PR. The Conservatives want to keep the current system, where the candidate with the most votes wins the seat. Most others propose change.
The NDP favours a kind of “mixed-member proportional representation” system.” As NDP democratic reform critic Craig Scott has described it, voters would get two ballots. The first would be to elect a riding MP, like the current system. The second would be to vote for candidates in a region, and the seats would be apportioned so each party’s tally would eflect the proportion of votes cast.
The Green Party also says they’d change the system to proportional representation, and would establish a multi-party Democratic Voting Commission to decide the details..
The Liberals have said they’ll get rid of the current first-past-the-post system, and set up an all-party parliamentary committee to look at various potential reforms. Mr. Trudeau has on many occasions said he’s not certain about PR, and expressed more interest in ranked ballots. That’s where voters rank their first and second choice, possibly more; if no one wins 50 per cent in a riding, then bottom candidates are dropped, and the second choices are used in a kind of instant run-off.